For one,with my limited knowledge of NFA items,the barrel length does nothing to a pistol.Barrel can be as long as you want.
But Mech tech claims their system can be changed back and forth from pistol to carbine.

I believe it used to be a nono, Thompson Center started debate with the ATF "OK" on their encore guns. but the ruling only applied to that specific gun. But as far as I can tell and according to MechTech it is ok to switch it back.
I read a while back that pistols can go to rifle and back, but rifles can only go to a pistol, and not be changed back. Meaning that in order to be turned back into a pistol it must have had to start out as a pistol.

For one,with my limited knowledge of NFA items,the barrel length does nothing to a pistol.Barrel can be as long as you want.
But Mech tech claims their system can be changed back and forth from pistol to carbine.

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